This is the type of switch you often find used as the pickup selector on electric guitars. The lever clicks through five different positions so you can select from three different inputs and a combination thereof.

This is a common 555 timer/oscillator from TI. A classic for all of those first year circuits projects where you need to blink an LED, generate tone, and thousands of other great beginning projects. Google around for a huge list of resources and example projects.

Digital calipers are an absolute essential. Here at SparkFun we use them all the time. These premium calipers come with an extra battery and auto shut-off. Measurements can be taken in either metric or standard. The calipers are 6" in length and make a great addition to any tool set. These come with two 1.5V LR44 button cell batteries.

The 7-Segment Serial Display turns the thirteen pins necessary to control a 4-digit seven segment display into just one or three. The display will give you full control of all digits, decimal points, the colon and the apostrophe.

The 7-Segment Serial Display turns the thirteen pins necessary to control a 4-digit seven segment display into just one or three. The display will give you full control of all digits, decimal points, the colon and the apostrophe.

This alcohol sensor is suitable for detecting alcohol concentration on your breath, just like your common breathalyzer. It has a high sensitivity and fast response time. Sensor provides an analog resistive output based on alcohol concentration.

This analog panel meter measures DC current from 0-20mA with 5% accuracy. It has a clear and easy to read scale and an adjustable dial. These can be useful for measuring the current on the GPIO pins on your microcontroller or numerous other applications.

This analog panel meter measures DC voltage from 0-5 volts with 2.5% accuracy. It has a clear and easy to read scale and an adjustable dial. These come in handy for measuring the output of sensors with 5V ranges.